Tool-holder.



PER F. HOLMGREN, 0F BROOKLYN, NEW YORK.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Apr. 19, 19317.

Application filed April 18, 1916. Serial No. 91,883.

To all whom t may concern.

13e it known that 1, PER F. HOLMGREN, a citizen of the TJnited States, and resident of Brooklyn, city of New York, county of Kings, and State of New York, have invented certain new and useful lmprovements in Tool-Holders, of which the following is a specification.

rlhis invention relates to a tool holder and cutting tool for a lathe, planer or like, the invention having more particular reference to that type of tool in which a small tool point or tool proper of high grade steel is held in a suitable holder or handle. The invention has for an object the protision of an improved construction adapted to allow of the tool being held with great rigidity in different angular positions. A further object is the provision of improved means for securing the tool-point or tool-proper in the holder against the thrust of the work in the machine while at the same time insuring of the easy removal of the tool-point when desired.

For further comprehension of the invention, and of the objects and advantages, reference will be had to the following description and accompanying drawings, and to the appended claims in which thenovel features of the invention are more particularly set forth.

Figure 1 of the drawings is a vertical sectional view of a machine tool constructed according to this invention, the View being taken on the line 1 1 of Fig. 2.

Fig. 2 is a vertical section on the line 2 2, Fig. 1.

Fig. 3 is a plan view thereof.

Fig. 4 is a vertical section on the line 4 4, Fig. 1, looking in the opposite direction to Fig. 2.

Fig. 5 is an underside perspective view of the tool-point or tool-proper.

1n the drawing 1 represents the small tool-point or tool-proper of high grade steel, the cutting point of said tool being indicated at 2. This tool-proper is removably mounted in a holder 3, the holder preferably having a dove-tail socket 4 formed on one face thereof in which the tool is adapted to be in serted longitudinally of itself, this socket tapering also from the front (that is from the point of insertion of the tool) toward the rear as indicated by the dotted line 5 in Fig. 3, the socket terminating at the rear in a wall 7 formed integral with the holder.

The sides of the tool are inclined toward one another in correspondence with the sides of the dovetail socket, the tool also tapering from front (or from its cutting point) toward the rear in correspondence with the socket. The wall 7 acts as an abutment wall to receive the strain of the work' in the machine and prevent jamming of the tool point in the socket.

To permit of angular adjustment of the cutting face of the tool with relation to the work the holder 3 is preferably adjustably mounted on the shank by which it is secured to the tool carriage. To this end the holder has projecting therefrom a stud 9 which passes through a transverse perforation in one end of the shank 10, which latter is adapted to be secured at its other'end in the tool carriage in the usual manner, the holder being clamped upon the shank by the nut 12 screwed upon the outer end of the stud 9.

The end of the shank 10 through which the stud 9 passes forms a support for the holder 3 and is preferably enlarged concentric to said stud to broadly circular outline and the periphery thereof is made of star wheel configuration as shown at 13, the axis of the star-wheel being coincident with the aXis of rotation of the holder. rlfhe latter may be provided with a circular flange 14 adapted to bear against the face of the starwheel.

As will be seen from the drawings the tool socket 4 and the periphery of the starwheel are substantially in alinement and the tool` 1 is of greater length than the socket, causing the tool to project from the holder angularly of the flange 14 over the periphery of the star-wheel 13, the under side of this projecting portion of the tool being shaped as shown at 15 to engage the various teeth of the star-wheel, according to the adjustment of the holder, to retain the latter against rotary movement on its aXis.

As shown more particularly in Fig. 1 the socket 4 and the peripheral edge of the starwheel 13 are preferably inclined somewhat to the aXis of the latter to cause the tool point to assume the proper inclined position with respect to the work being acted upon. The tool may be adjusted to the desired angular position by unscrewing the nut 10 and withdrawing the stud 9 in the shank head. The tool being drawn longitudinally along the interstices between adjacent points of the star-wheel with which it engages, the corners of the tool base which engage in the socket l being preferably rounded as chosen at 17 to facilitate withdrawal. To further facilitate withdrawal of the tool the portion 15 thereof may, if desired, be disposed so as to fit rather loosely between the point of the star-wheel the lateral thrust of the work in the machine throwing the part 15 against one face of the star point, when it is rigidly held, when the tool is in use.

llhat I claim is: 1. A machine tool comprising, in combination, a tool-proper, a holder therefor, a support for said holder having a portion of its periphery of star-wheel configuration adapted to be engaged by said tool-proper to permit of angular adjustment of said tool and holder, and a complementary part formed on said tool-proper adapted to engage said star-wheel portion and to retain the holder in its angular adjustment.

2. A machine tool comprising, in combination, a tool-proper, a holder therefor having a socket adapted to receive the tool proper, a support of star-wheel conguration in which said holder is rotatably mounted on an axis coincident with the axis of the star-wheel, the said socket in the holder being in alinement with the periphery of the star-wheel, the said tool havinga portion thereof projecting from the said socket adapted to project over and engage the teeth of the star-wheel to retain the said .holder against rotation.

3. A machine tool comprising, in combination, a tool-proper, a holder therefor having a socket of less length than the toollproper adapted to receive the latter, a support of star-wheel configuration in which said holder is rotatably mounted on an axis coincident with the axis of the star-wheel, the said socket in the holder being in alinement with the periphery of the star-wheel, ilo cause portion of the tool projecting from the said socket to project over and engage the teeth of the star-wheel to retain the holder against rotation.

4. A machine tool comprising, in combination, a support, a holder vfor a toolproper adjustably mounted in said support, said holder having on one face a dovetail socket tapering in width from front torear and an abutment wall formed integral with the holder at the rear of said socket adapted to engage the tool-proper to preventjamming of the same in the socket and to receive the strain of the work, a tool-proper having its sides shaped in correspondence with the walls of the socket adapted to be inserted therein and held by said abutment wall in engagement with said support to retain said holder in position.

5. A machine tool comprising in combination, a tool proper, a holder therefor, a support in which said holder is rotatably mounted, said holder being adapted to rigidly support the tool proper independentlyof the said support, and inter-engag-4 ing parts on said support and tool proper whereby the holder is retained against rotary movement on its support.

6. A machine tool comprising, in combination, a tool proper, a holder therefor, a support in which said holder is rotatably mounted, said support and holder having contacting faces adapted to slide rotatably one upon the other, said tool proper projecting angularly of said contacting faces from the said holder, and inter-engaging parts on said support and tool proper whereby the said holder is held against rotary movement on the said support.

7. A machine tool comprising, in combination, a tool proper, avholder therefor, a support in which said holder is rotatably mounted, said support presenting a portion of broadly circular outline concentric With the axis of rotation of said holder, said tool proper being adapted to project from said holder over the said circular surface of the support, and inter-engaging parts on said tool proper and circular surface whereby the holder is held against rotation on the support. n

8. A machine tool comprising, a tool proper, a holder therefor having a socket adapted to receive the tool proper, a support in which said holder is rotatably mounted, said support presenting a portion of broadly circular outline concentric with the axis of rotation of said holder, the said socket being substantially in alinement with the said circular surface, the said tool having a portion thereof projecting from the said holder adapted to engage complementary parts on the said circular surface to retain the holder against rotation.

9. A machine tool comprising, in combination, a tool proper, a holder therefor having a socket adapted to receive the tool proper, a support in which said holder-is rotatably mounted, the said socket extending in a direction nearly parallel to the axis of rotation of the said holder, and the said tool projectingfrom said socket into engagement with the said support to retain the holder against rotation.

Signed at city, countyT and State of New York, this 31st day of March, 1916.

PER F. HOLMGREN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

